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E. 'FRIC KE 1,807,734

RAIL POINT Filed July 7. 1930 M v m In wen/v0:

Patented June 2, 1931 omen STATES PATENT? o en;

ERICI-I FRICKE, OF DORTMUND, GERMANY, ASSIGNOR TO IFIRM VEREINIGTE STAHL- WER-KE AKTIENGESELLSCHAFT, OF DUSSELDORF, GERMANY RAIL' rornr Application filed .Tuly 7, 1930, Serial No.

In the known double slip points with tongues or points disposed outside the diamond of the tracks, the outer rail edges of the branch line come so close together in the vmiddle that the centre section of rail is only the width of a rail head for adistance of to 6 metres. Hence, this one rail is passed over by the rolling stock on both sides, and as this rail is provided in curves it is subjected to heavy wear on both the outer rail edges. Moreover this centre rail is also subjected to heavy wear on the top being crossed over by rolling stock coming from both branch lines. Owing to this particularly heavy wear this rail requires to be prematurely replaced.

In explanation of the wear on the centre section of rail the curvature of the wearing edges to the cent-re section after a considerable period of service is represented in the accompanying drawings in which Figs. 1 and 2 show known constructional forms of rail joints.

Fig. 3 is a plan view showing the cong5 structional form of the invent-ion.

Fig. 4: shows a center section of the rail point.

Fig. 5 is a sectional view on line VV of Fig. 3.

39 Figure 1 shows diagrammatically one end of the centre section in which the branch curved rails join the straight centre rail to form an angle. The lateral pressure of the rolling stock in passing over thecurve wears down the curved rail bent, and in course of time the wearing edge is reduced to the position indicated by the dotted lines. At the position where the curve changes to the straight track the line of wear is continued 40 in the direction of the curve, so that the width of the head at the beginning of the straight centre section of rail is considerably reduced.

Making the centre section of rail bent in the form of an S, with two short side rails has the additional disadvantage that even with the theoretically tangential approach of the curve towards the centre rail as shown in Figure 2, this prevents the possibility of be shortening the side rails, required in 466,238, and in Germany July 15, 929. I

rails as far as the commencement of the curve entails breaking off the tips, so that anangur lar bend results at this point and will lead to lines of Wear similar to thoseshownin Figure 1. 1

A further'defect of the existing arrangement is the unfavourable behaviour in trav-A ersing the switch, since the change 7 from curves of comparatively small radius to the intermediate straight part of the centre member section of rail causes lateral shocks through the sudden change in the position of the vehicles, which shocks are intensified by the sharp bends in passing from the curve into the straight. i 1

.It will be understood that the wear will be reduced by increasing the radius of the switch curves at the points where 'theyflreach; the common cent-re rail. All these defects of the existing forms of double slip points are avoided according to the invention. The heavy wear on the double-duty centre rail is prevented by spacing the outer wearing edges of the'branch railslso far apart;

that two rails, each of the same total length as the centre-section of rail, are employed. These rails are laid in direct contact and are firmly connected together, for example by means of filling pieces and bolts.

Figure 3 is a plan of a double slip point according to the invention. Figure 5 is a section along the line V'V of Figure 3, the

rails forming the centre section beingfor. example ordinary Vignol rails.

In order to prevent the undue lateral wear on the centre section and the jolting which occurs in traversing the point, owing to the sharp bend in passing from the curve into'the straight track, the invention pro-1' the centre part or section, betweenthe actual.

point curvestheradius may be larger. In

order to reduce the head width of the centre a from relative shifting by interlocking notches, or filling members, and by bolting or/and welding them together.

It is also possible to remedy only one of the two defects, namely the sharp bend by joining together the two continuous rails forming the centre section from curves and straight par-ts joined up tangentially thereto.

Figure A represents the centre section formed of two continuous rails.

The invention enables a radius of at least metres to be employed for a track gauge of 4.5 metres.

I claim 1. Double slip points with points disposed outside the diamond arrangement of the tracks in which the centre section passed over by rolling stock on both sides consists of two rails in direct contact, which are securely connected together for example by filling pieces and bolts.

2. Double slip points with points disposed outside the diamond arrangement of the tracks, in which the centre section passed over by rolling stock on both sides consists of two rails in direct contact, the said two rails forming the centre section being curved throughout.

3. Double slip points with points disposed outside the diamond arrangement of the tracks, in which the centre section passed over by rolling stock on both sides consists of two rails in direct contact, the said two rails forming the centre section being composed of curves and straight parts joined tangentially thereto.

4. Double slip points with tongues or points disposed outside the diamond arrangement of the tracks, in which the centre section passed over by rolling stock on both sides consists of two rails in direct contact, the said two rails forming the centre section being securely connected together.

5. Double slip points with points disposed outside the diamond arrangement of the tracks, in which the centre section passed over by rolling stock on both sides consists of two rails in direct contact, the said two rails forming the centre section being curved throughout and being securely connected together.

6. Double slip points with points disposed outside the diamond arrangement of the tracks, in which the centre section passed over by rolling stock on both sides consists of two rails in direct contact, the said two rails forming the centre section being composed of curves and straight parts joined tangentially thereto and being securely connected together.

ERICH FRIGKE. 

